Powered hand tool

ABSTRACT

A housing with an elongated stem portion has a crankshaft mounted within the housing. A tool such as a saw or wood chipper extends through the elongated stem and is coupled to the shaft. An electric motor rotates the shaft causing reciprocal motion of the tool. A grinding wheel and a drill chuck are mounted on the shaft.

United States Patent Coffman et a1.

[54] POWERED HAND TOOL 1,548,439 3/1925 Boucher 144/1 E 48,863 7/1865Zeidler 144/75 [751 Invemms: 9 Siam" 2,122,611 7/1938 Kirby 143/68 EPittsburgh, Pa. 15205; Thomas W. I Reichner, Pittsburgh, Pa. 73Assignee: said Cohan, by said Reichner Primary Examiner-Donald R.Schran- Attorney-Bud], Blenko and Ztesenherm [22] Filed: Oct. 26, 1971[21] Appl. No.: 192,419

[57] ABSTRACT [52] US. Cl. 144/] E, 408/22, 144/35 R,

' 144/75 A housing with an elongated stem portion has a crank- 1 1327cB27f B270 shaft mounted within the housing. A tool such as a saw 1 Field0f swl'ch 143/68 E, 68 F, 68 or wood chipper extends through theelongated stem 1 3/6 63 1 1 408/22 and is coupled to the shaft. Anelectric motor rotates the shaft causing reciprocal motion of the tool.A grind- [56] Ref r n s C t ing wheel and a drill chuck are mounted onthe shaft.

UNITED STATES PATENTS I 2,133,862 12/1938 Johnston 143/68 E 2 Claims, 8Drawing Figures 54 32 WE leg 32 I6 L9 18b Y. 13 24 s i 5 II I 48 l- L 5.1

. 1 F i 1 mw m M II Patented Aug. 14, 1973 2 Sheets-Sheet 1 IN VE' NTORS Oscar D. Coffman Thomas M. Reiclmer BY w Z4 4 WQ Fig. 4

4 o '40" 2 6 4 2 r. 4 m 4 a V m w .V 4 4747/ I Fig.

THE/R ATTORNEYS Fig. 3

Patented Aug. 14, 1973 3,752,200

2 Sheets-Sheet 2 IN VENTORS. Oscar 0. Coffman' THE/R A TTORNE Y8 ThomasW Rafa/me! POWERED HAND TOOL This invention relates to a powered handtool for chipping wood, sawing, grinding and drilling. There ispresently a need for a simplified design of a tool which is capable ofeither chiseling wood or sawing in the hand-type tool version. The tool,also, should have the capability of drilling and grinding.

We have invented an apparatus of relatively simple design capable ofchiseling or sawing with grinding and drilling capabilities.

We provide a powered hand tool comprising a housing having an elongatedstem portion, a crankshaft mounted within the housing, a tool within thestem portion and extending from the stem portion, means coupling thetool to the shaft in such a manner that rotation of the shaft causesreciprocating motion of the tool and means rotating the shaft andmounted within the housmg.

Other objects, features and advantages of the invention will be apparentfrom the following description of the present preferred embodiment.

In the accompanying drawings we have shown a present preferredembodiment of the invention and have illustrated a method of practicingit in which:

FIG. 1 is a vertical sectional view of a powered hand tool; I

FIG. 2 is an end view partly in section taken on the line llll of FIG.1;

FIG. 3 is an enlarged fragmentary view taken on the line IIlllI of FIG.1;

FIG. 4 is an enlarged fragmentary view taken on the line IV-IV of FIG.1;

FIG. 5 is an end elevational view of the retractable shield as viewed onthe line VV of FIG. 1;

FIG. 6 is a transverse sectional view of the handle and tool carrier andtaken on the line VI-VI of FIG. 1;

FIG. 7 is an end elevational view from the right of FIG. 1 of a tiltablebase used with alternate tooling;

FIG. 8 is a view in section of the lower handle illustrating analternate tool adapter.

The powered hand tool comprises a housing 10 which acts as a case. Thehousing 10 has a first end portion 11 and a second end portion 13. Amotor 12 is inserted in the first end portion 11 and drives a crankshaft18 (18a, 18b and 18c) which extends from the first end portion 11 to thesecond end portion 13 of the housing 10. The crankshaft 18 is fonned bya crank throw 18a, a first journal end portion 180 and a second journalend portion 18b. Drive pinion 14 coupled to motor 12 drives gear 16keyed at 17 to the first journal end portion 18c. The crankshaft 18 isheld by bearings 30, with spacers 32. An abrasive wheel (grinding wheel)36 is journaled on the second journal end 18b of the crankshaft l8 andspaced from bearing 30 by spacer 34. One end 19 of the second journalend 18b of the crankshaft 18 is threaded to which drill chuck 40 ismounted and spaced from grinding wheel 36 by spacer 38. A retractableshield 54 covers the grinding wheel 36 when not in use.

A connecting link 20 is coupled to the crank throw 18a. A wrist pin 22couples a reciprocating tool carrier 24 to the connecting link 20. Atthe top of chisel 46 is mounted a chisel shank hex head 48 which restsin the hex cavity 26. A set screw 50 locks the hex head 48 with the toolcarrier 24. The tool carrier 24 and tool (chisel 46) are inserted withinan elongated stem portion 28 which acts as a combination handle andguide for the tool carrier 24.

The depth of penetration of the tool whether a chisel 46 or saw blade 60is adjustable by adjustable depth gauge 42 provided with a tiltable shoe44.

The chisel 46 can be replaced by the saw adapter 58 with blade 60 andtiltable shoe 62. This is done by removal of set screw 50 andreplacement of the saw adapter 58 which fits into the hex cavity 26 ofthe tool carrier 24.

A handle 52 on housing 10 enables holding the tool as well as elongatedstem 28.

A plate 56 enables the electric motor 12 to be inserted and removed.

The operation of the powered hand tool is as follows: the motor turnsthe crankshaft causing reciprocating motion of the tool carrier member24 which carries either the chisel 46 or the saw 60. The grinding wheel36 acts as a fly wheel to provide an even torque during initialdrilling, wood chipping or sawing.

We claim:

1. A powered hand tool comprising:

l. a housing comprising a main tubular portion and a second tubularportion intersecting said main portion at a right angle between the endsthereof;

2. a crankshaft within the main portion of said housing having a crankin registry with said second portion of said housing;

3. bearing means on opposite sides of said crank supporting saidcrankshaft within the main portion of said housing;

4. a tool reciprocatively mounted within said second portion of thehousing and operated by said crank;

5. motor means at one end of said main portion of the housing drivinglyconnected to said crankshaft;

6. a grinding wheel within the main portion of the housing adjacent theend opposite said motor means;

7. and a drill chuck mounted on the end of said crankshaft opposite saidmotor means.

2. A powered hand tool according to claim I, wherein the main portion ofsaid housing includes a handle, said handle being diametrically oppositesaid second tubular portion of the housing and enabling the operator tohold the tool for operation of the drill chuck, the tool or the grindingwheel.

1. A powered hand tool comprising:
 1. a housing comprising a maintubular portion and a second tubular portion intersecting said mainportion at a right angle between the ends thereof;
 2. a crankshaftwithin the main portion of said housing having a crank in registry withsaid second portion of said housing;
 3. bearing means on opposite sidesof said crank supporting said crankshaft within the main portion of saidhousing;
 4. a tool reciprocatively mounted within said second portion ofthe housing and operated by said crank;
 5. motor means at one end ofsaid main portion of the housing drivingly connected to said crankshaft;6. a grinding wheel within the main portion of the housing adjacent theend opposite said motor means;
 7. and a drill chuck mounted on the endof said crankshaft opposite said motor means.
 2. a crankshaft within themain portion of said housing having a crank in registry with said secondportion of said housing;
 2. A powered hand tool according to claim 1,wherein the main portion of said housing includes a handle, said handlebeing diametrically opposite said second tubular portion of the housingand enabling the operator to hold the tool for operation of the drillchuck, the tool or the grinding wheel.
 3. bearing means on oppositesides of said crank supporting said crankshaft within the main portionof said housing;
 4. a tool reciprocatively mounted within said secondportion of the housing and operated by said crank;
 5. motor means at oneend of said main portion of the housing drivingly connected to saidcrankshaft;
 6. a grinding wheel within the main portion of the housingadjacent the end opposite said motor means;
 7. and a drill chuck mountedon the end of said crankshaft opposite said motor means.